Assuming you have a working copy of the font, here is how to install and use it correctly.
Even if you find a copy of Xarab.shx online, it may use a non-standard code page (like CP-1256 or custom mapping). If the original drafter used a specific version of the font, a different version will still render the text as garbage. Xarab.shx Autocad Font
Unlike simplex.shx or complex.shx , you will not find Xarab.shx in a clean installation of AutoCAD, even in the Middle Eastern versions. Modern versions (2020 onwards) use like Arial or dedicated Tahoma for Arabic. Xarab.shx is a relic. Assuming you have a working copy of the
Adobe DC - Disable AutoCAD SHX Text box functionality | Community Xarab.shx Autocad Font